<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/vue.js" ></script>
</head>
<body>
<div id="app">
   <h1 v-once >01: {{message}}</h1>
   <h1 v-html="htmlString" > </h1>
   <h1 v-text="message" >02: </h1>
</div>
<script>
    const  vm = new Vue(
        {
            el:"#app",
            data:{
                message:'Hello Vue!',
                htmlString:'<div>Hello Div</div>'
            }
        }
    )

</script>


</body>
</html>